Probably about $35 for the XT.rsquared28 said:I would keep the un-used derailluer for a spare.
What are you going to get for a used derailluer on FleaBay? Not much.
Not worth the effort to me.
My luck would be, as soon as that derailleur shipped out, after selling for $10, I would frag one on the trail and have to pay full price for a new one.